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<code class="classname">ClutterScore</code> 可以一次开始和停止几条时间线，或者一条接一条顺序运行。
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要添加首先被执行的时间线，调用 <code class="function">clutter_score_append()</code> ，并为其 parent 参数传入 NULL，当调用 <code class="function">clutter_score_start()</code> 时，改时间线将被启动。
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要添加一条时间线并设置其在已经加入的某条时间线之后执行，调用 <code class="function">clutter_score_append()</code>，并为 parent 参数传入前序时间线。
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